For a microniche or autoblog, where I don't really care about SEO, and it's just one site in a few hundred, yes I would recommend just the .com.

For a larger site, that you're going to invest time and energy into and be your primary focus, I would register all 3 and .info just to keep the competition away - $20-30 / year is peanuts compared to having a decently SEO'd competitor trying to rank on the SERPS and possibly leach a portion of your traffic.

Keep in mind that SEO isn't always "just about you" - limiting a competitor's ability to SEO (or copying parts of a competitor's SEO setup) can be a powerful strategy.

Yes, since the cost of regging the other tld's is pretty low, I'll often grab alot of them if I like a name. net org info for sure, sometimes a cctld if something is fairly geo-targetted.

Another reason I do that sometimes is if a .com name kinda takes off, then I look at building out an authority site or a trusted site of some sort on the net or the org. For example, if I had a site promoting a product (let's say blackhatthongs.com) and it got at all popular, then I would keep the .com as a promotional site and build out blackhatthongs.net as an "independent" review/forum/authority site.

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